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+--- Thread: Haier air conditioner (/showthread.php?tid=4458)
Haier air conditioner - a455115 - 21.12.2022
Hello, everyone.
I have a Haier air conditioner that I want to control through its RS 232 port. I found a description of how to make an MQTT device with an ESP 8266, but I don't want it to go over wifi. I can't convert RS 232 commands myself so please help. I am attaching the code with the commands for arduino, how to convert them for LM to reduce Wi-Fi devices. Please if anyone can and has the necessary time - I would be grateful for any help.
GitHub
RE: Haier air conditioner - admin - 21.12.2022
It won't work directly via RS232. You will need RS232 - TTL 5V converter and some soldering as the AC uses USB port for serial communication.
The command format is described here: https://blog-instalator-ru.translate.goog/archives/433?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
RE: Haier air conditioner - a455115 - 22.12.2022
(21.12.2022, 09:57)admin Wrote: It won't work directly via RS232. You will need RS232 - TTL 5V converter and some soldering as the AC uses USB port for serial communication.
The command format is described here: https://blog-instalator-ru.translate.goog/archives/433?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
Yes, that's clear, but I wanted to use the LM directly with a USB to TTL converter.
RE: Haier air conditioner - admin - 23.12.2022
Example of sending data packets:
Code:
port = require('serial').open('/dev/ttyUSB0', { baudrate = 9600 })
function send(...)
local data = string.char(...)
local len = #data + 1
local hdr = string.char(0xFF, 0xFF, len)
local csum = len
for _, byte in ipairs({ ... }) do
csum = bit.band(csum + byte, 0xFF)
end
local pkt = hdr .. data .. string.char(csum)
port:write(pkt)
end
send(0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x4D, 0x02) -- turn on
send(0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x4D, 0x03) -- turn off
send(0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x4D, 0x01) -- request stateRE: Haier air conditioner - a455115 - 23.12.2022
Thank you so much! I'll try these days that I'm not at the air conditioner right now.
As always great admin!
Merry Christmas and New Year holidays!